Machine for seaming elbows



faces of the parts UNITED STATES PATENT OFFICE.

EDWARD W. STODDARD, OF DETROIT, MICHIGAN.

MACHINE FOR SEAMING ELBOWS.

SPECIFICATION forming part of Letters Patent No. 236,918, dated January 25, 1881.

Application filed October 8, 1880. (No model.)

To all whom it may concern Be it known that I, EDWARD W. STODDARD, of Detroit, in the county of Wayne and State of Michigan, have invented an Improvement in Machines for Seaming Elbows, of which the following is a specification.

The nature of my invention relates to certaint, new, and useful improvements in that class of machines by means of which the scams or joints of stove-pipe elbows are locked and completed. The machine is designed to complete suchijoints of the elbows on the inside thereof, so as to have a plain smooth surface upon their outside surface, and to be employed in the manufacture of what are known as curved elbows.

The invention consists in the peculiar construction, arrangement, and operation of the various parts, as more fully hereinafter described.

Figure 1 is a perspective view of my improved machine as seen when in use. Fig. 2 is a longitudinal central vertical section. Fig. 3 is an elevation, showing the reverse side of the plunger. Fig. 4 shows the inner face of a section of an elbow, showing the parts of sheet metal which form the same, and put together ready for the machine to complete the look.

In the accompanying drawings, which form a part of this specification, a represents the strips of sheet metal of which the elbow is formed. These strips, havingbeen cut to proper shape and their edges crimp'ed to form the looks or joints 1), are put together, as shown, preparatory to being presented to the machine for finishing.

The machine is follows:

A is a table or frame, to which the bed B is securely and rigidly attached. This bed-plate terminates in. an. overhanging spheroidalshaped head, 0, the rear face, 0, of which is vertical, and provided at its upper end with an offset, in which is secured a steel jaw, c.

D is a jaw with a front verticalface, d, the upper end being provided with an offset in which is secured asteel jaw, 0, both the steel jaws bein g in vertical line with the respective vertical 0 D, to which they are at- Dis secured'to the front end constructed and operates as tached. The jaw of the slide E and held in place by the boxes F, through which the slide or shaft E has a reciprocating movement, being actuated in its forward movement by depressing the free end of the treadle-lever G, which draws the rod H downward and straightens the links 1 to a horizontal plane. One pair of these links is pivoted to the rear end of the slide E, and the other pair to the rear end of the bed B, while their inner ends are pivoted together and to the top of the rod H. When the pressure is removed from the treadle-lever G the coilspring J lifts the lever, thereby elevating the rod H and throwing the links I into the position shown in the drawings, which communicates a retrograde motion to the slide E and the jaw D thereto attached.

Kis a plunger, the lower face or edge of which is curved to suit the face of the head 0. This plunger is pivotally secured to the lever L, one end of which is pivoted to the standard M.

A rod, N, pivoted at its lower end to the lever 0, passes through an eye in the outer end of the lever L, and its upper end is provided with a nut or stop, h, between which and the lever L, and surrounding the rod N, is placed the coil-spring P.

The lever O is pivoted at one end to a fixed point, Q, while the opposite end is secured to the treadle-lever Gr, so that the depression of said last-named lever will simultaneously move forward the jaw D and bring down the plunger, and the pressure being relieved the springs J andP compel the opposite motions.

The plunger, in order to secure a true vertical movement, is provided with two vertical slots, i, through which bolts pass to the curved standards R, which are secured to the bed B.

In practice the joint I) is laid between the jaws o and e, (the elbow sliding over the head 0,) when pressure upon the treadle-lever G forces the jaw D forward, thereby compressing the joint b between the steel jaws c and 0, while the same movement brings the lower edge of the plunger down upon the joint or seam in the elbow, thereby keeping the outer face thereof perfectly smooth.

What I claim as my invention is- 1. In an elbow-seaming machine, the combination, with the fixed head 0 and horizontally-reciprocating head I), both adapted to support and be inclosed in a, pipe-elbow with the seam between them, of the "ertieally-reciprocating head K, and mechanism, substantially as described, whereby the reciprocating heads are operated simultaneously, substantially as described, and for the purpose set forth.

2. The combination of the head 0, having 10 the jaw c, slide E, provided with the jaw 07,

toggle-joint I I, rod H, and treadle-lever G, with the plunger K, lever L, rod N, and lever O, secured at its outer end to the treadledever, whereby the slide and plunger may be simultaneously operated, substantially as described, and for the purpose set forth.

EDWARD W. STODDARD. Witnesses:

H. S. SPRAGUE, ALBERT WAHL. 

